Golgari Guildmage is a uncommon Creature — Elf Shaman card from Ravnica: City of Guilds (RAV), collector number 248. Current market price: $0.15 (foil $1.65), TCGplayer market prices via Scryfall.
{4}{B}, Sacrifice a creature: Return target creature card from your graveyard to your hand. {4}{G}: Put a +1/+1 counter on target creature.